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Warrants (Tables)
9 Months Ended
Sep. 30, 2018
Warrants [Abstract]  
Outstanding Common Stock Warrants
Outstanding common stock warrants at September 30, 2018 consist of the following:
Issue Date
Expiration Date
 
Total Warrants
  
Exercise Price
 
        
10/31/2013*
 4/30/2019
  
137,143
  
$
3.75
 
2/5/2014*
   2/5/2019
  
265,947
  
$
3.75
 
7/24/2014
 7/24/2019
  
1,239,769
  
$
3.75 - $ 12.25
 
6/22/2015
 6/22/2020
  
600,000
  
$
3.75
 
12/30/2015
12/30/2020
  
130,089
  
$
5.65
 
1/29/2016
  1/29/2021
  
19,812
  
$
5.30
 
    
2,392,760
     
*These warrants are classified as liabilities.